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TLS通信

gtcp模块支持TLS加密通信服务端及客户端,在对安全要求比较高的场景中非常必要。TLS服务端创建可以通过NewServerTLS或者NewServerKeyCrt方法实现。TLS客户端创建可以通过NewConnKeyCrt或者NewConnTLS方法实现。

使用示例:

https://github.com/gogf/gf/tree/master/geg/net/gtcp/tls

package main

import (
	"fmt"
	"github.com/gogf/gf/g/net/gtcp"
	"github.com/gogf/gf/g/os/glog"
	"github.com/gogf/gf/g/util/gconv"
	"time"
)

func main() {
	address := "127.0.0.1:8999"
	crtFile := "server.crt"
	keyFile := "server.key"
	// TLS Server
	go gtcp.NewServerKeyCrt(address, crtFile, keyFile, func(conn *gtcp.Conn) {
		defer conn.Close()
		for {
			data, err := conn.Recv(-1)
			if len(data) > 0 {
				fmt.Println(string(data))
			}
			if err != nil {
				// if client closes, err will be: EOF
				glog.Error(err)
				break
			}
		}
	}).Run()

	time.Sleep(time.Second)

	// Client
	conn, err := gtcp.NewConnKeyCrt(address, crtFile, keyFile)
	if err != nil {
		panic(err)
	}
	defer conn.Close()
	for i := 0; i < 10; i++ {
		if err := conn.Send([]byte(gconv.String(i))); err != nil {
			glog.Error(err)
		}
		time.Sleep(time.Second)
		if i == 5 {
			conn.Close()
			break
		}
	}

	// exit after 5 seconds
	time.Sleep(5 * time.Second)
}

执行后,可以看到客户端执行时报错:

panic: x509: certificate has expired or is not yet valid

那是因为我们的证书是手动创建的,并且已经过期了,为了演示方便,我们在客户端代码中去掉客户端对证书的校验。

package main

import (
	"fmt"
	"github.com/gogf/gf/g/net/gtcp"
	"github.com/gogf/gf/g/os/glog"
	"github.com/gogf/gf/g/util/gconv"
	"time"
)

func main() {
	address := "127.0.0.1:8999"
	crtFile := "server.crt"
	keyFile := "server.key"
	// TLS Server
	go gtcp.NewServerKeyCrt(address, crtFile, keyFile, func(conn *gtcp.Conn) {
		defer conn.Close()
		for {
			data, err := conn.Recv(-1)
			if len(data) > 0 {
				fmt.Println(string(data))
			}
			if err != nil {
				// if client closes, err will be: EOF
				glog.Error(err)
				break
			}
		}
	}).Run()

	time.Sleep(time.Second)

	// Client
	tlsConfig, err := gtcp.LoadKeyCrt(crtFile, keyFile)
	if err != nil {
		panic(err)
	}
	tlsConfig.InsecureSkipVerify = true

	conn, err := gtcp.NewConnTLS(address, tlsConfig)
	if err != nil {
		panic(err)
	}
	defer conn.Close()
	for i := 0; i < 10; i++ {
		if err := conn.Send([]byte(gconv.String(i))); err != nil {
			glog.Error(err)
		}
		time.Sleep(time.Second)
		if i == 5 {
			conn.Close()
			break
		}
	}

	// exit after 5 seconds
	time.Sleep(5 * time.Second)
}

执行后,终端输出结果为:

0
1
2
3
4
5
2019-06-05 00:13:12.488 [ERRO] EOF 
Backtrace:
1. /Users/john/Workspace/Go/GOPATH/src/github.com/gogf/gf/geg/net/gtcp/tls/gtcp_server_client.go:25

其中客户端在5秒后关闭了连接,因此服务端在接收数据时获取到了一个EOF错误,这种错误在正式使用中我们直接忽略,报错时服务端直接关闭客户端连接即可。